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Abstract：
OBJECTIVE: To examine whether targeted determinants mediated the effects of the HEalth In Adolescents (HEIA) intervention on fruit and vegetable (FV) consumption and explore if these mediating effects were moderated by sex, parental education or weight status.
METHODS: Cluster-randomised controlled trial.
METHODS: The HEIA study (2007-2009) was a Norwegian 20-month multi-component school-based intervention to promote healthy weight development. FV consumption and targeted determinants were self-reported at baseline, mid-way (8 months) and post-intervention (20 months).
METHODS: Adolescents (11-13-year-old) in twenty-five control schools (n 746) and twelve intervention schools (n 375).
RESULTS: At post-intervention, more adolescents in the intervention group compared with the control group had knowledge of the FV recommendations (OR: 1·4, 95 % CI 1·1, 1·9) and reported a decreased availability of vegetables at home (β: -0·1, 95 % CI -0·2, 0·0). Availability/accessibility of FV at home, availability of vegetables at dinner, taste preferences for different types of FV and knowledge of the FV recommendations were positively associated with the consumption of FV. However, none of the post-intervention determinants significantly mediated the intervention effects on FV consumption. Although no moderating influences by sex, parental education or weights status were observed on the mediating effects, exploratory analyses revealed significant moderations in the b-paths.
CONCLUSIONS: Since none of the targeted determinants could explain the increase in FV consumption, it remains unclear why the intervention was effective. Reporting on a wide range of mediators and moderators in school-based interventions is needed to reveal the pathways through which intervention effects are achieved.
METHODS: Cluster-randomised controlled trial.
METHODS: The HEIA study (2007-2009) was a Norwegian 20-month multi-component school-based intervention to promote healthy weight development. FV consumption and targeted determinants were self-reported at baseline, mid-way (8 months) and post-intervention (20 months).
METHODS: Adolescents (11-13-year-old) in twenty-five control schools (n 746) and twelve intervention schools (n 375).
RESULTS: At post-intervention, more adolescents in the intervention group compared with the control group had knowledge of the FV recommendations (OR: 1·4, 95 % CI 1·1, 1·9) and reported a decreased availability of vegetables at home (β: -0·1, 95 % CI -0·2, 0·0). Availability/accessibility of FV at home, availability of vegetables at dinner, taste preferences for different types of FV and knowledge of the FV recommendations were positively associated with the consumption of FV. However, none of the post-intervention determinants significantly mediated the intervention effects on FV consumption. Although no moderating influences by sex, parental education or weights status were observed on the mediating effects, exploratory analyses revealed significant moderations in the b-paths.
CONCLUSIONS: Since none of the targeted determinants could explain the increase in FV consumption, it remains unclear why the intervention was effective. Reporting on a wide range of mediators and moderators in school-based interventions is needed to reveal the pathways through which intervention effects are achieved.
摘要：
目的：研究是否有针对性的决定因素介导了青少年健康（HEIA）干预对水果和蔬菜（FV）消费的影响，并探索这些中介效应是否受性别调节，父母教育,或体重状态。
方法：整群随机对照试验。
方法：HEIA研究（2007-2009年）是挪威一项为期20个月的基于学校的多组分干预措施，以促进健康的体重发展。FV消耗和目标决定因素在基线时自我报告，中途（8个月），和干预后（20个月）。
方法：25所对照学校（n=746）和12所干预学校（n=375）的青少年（11-13岁）。
结果：在干预后，与对照组相比,干预组更多的青少年了解FV建议(OR:1.4,95%CI:1.1;1.9),并且报告家庭蔬菜供应减少(β:-0.1,95%CI:-0.2;0.0).FV在家中的可用性/可访问性，晚餐时蔬菜的供应，不同类型FV的口味偏好，对FV建议的了解与FV的消费呈正相关。然而,干预后的决定因素均未显著介导干预对FV消耗的影响。虽然没有性别的缓和影响，父母教育,或体重状态观察到中介效应，探索性分析显示，b路径具有显著的缓和性。
结论：由于没有一个目标决定因素可以解释FV消耗的增加，目前尚不清楚干预措施为何有效.需要报告以学校为基础的干预措施中的各种调解人和主持人，以揭示实现干预效果的途径。
方法：整群随机对照试验。
方法：HEIA研究（2007-2009年）是挪威一项为期20个月的基于学校的多组分干预措施，以促进健康的体重发展。FV消耗和目标决定因素在基线时自我报告，中途（8个月），和干预后（20个月）。
方法：25所对照学校（n=746）和12所干预学校（n=375）的青少年（11-13岁）。
结果：在干预后，与对照组相比,干预组更多的青少年了解FV建议(OR:1.4,95%CI:1.1;1.9),并且报告家庭蔬菜供应减少(β:-0.1,95%CI:-0.2;0.0).FV在家中的可用性/可访问性，晚餐时蔬菜的供应，不同类型FV的口味偏好，对FV建议的了解与FV的消费呈正相关。然而,干预后的决定因素均未显著介导干预对FV消耗的影响。虽然没有性别的缓和影响，父母教育,或体重状态观察到中介效应，探索性分析显示，b路径具有显著的缓和性。
结论：由于没有一个目标决定因素可以解释FV消耗的增加，目前尚不清楚干预措施为何有效.需要报告以学校为基础的干预措施中的各种调解人和主持人，以揭示实现干预效果的途径。
